We've done over 60 rooms across the southeast US, and this is one of my favorites. Spellbound is a very difficult room, and another couple would have been very helpful as there were 2 puzzles that were very time consuming. I'd say it's perfect for a group of 4-6.
The immersion and surprises were some of the best I've seen, amazingly well done room. Definitely my #1 room we didn't finish, and probably in my top 5 overall.